11 - Beneficial Soil Organisms

11 - Beneficial Soil Organisms - Beneficial Soil Organisms...

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Beneficial Soil Organisms
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Sequence of Events in Decomposition Many different organisms involved in decomposition Undescribed species, etc. Organisms have many different functions…. . soil animals bacteria soil chemistry Organic detritus humus mineralization material (small particles) (litter)
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Many different organisms in a liter of soil
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Direct Decomposition of OM Mostly done by: Bacteria Fungi Actinomycetes Animal OM decomposed by many different organisms, many insects (ants, flies, beetles, etc.)
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Bacteria from Cowpea Roots
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Fungi
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Actinomycetes = Bacteria with filamentous, branched growth habit
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Breakup of OM into Smaller Particles Macroinvertebrates (don’t need a microscope or hand lens to identify): Earthworms (segmented worms). also important in improving soil structure. Termites. important in breakdown of wood with high C:N ratio. especially important in tropics. Millipedes, isopods feed on plant debris in organic matter.
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Millipede
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Macroinvertebrates Coleman and Crossley, 1996 Isopods Millipedes
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Ants vs Termites
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Invertebrates Nematodes (unsegmented worms) Annelids (segmented worms, Earthworms) Snails and slugs Arthropods (jointed appendages) Crustaceans Insects Arachnids (spiders, mites) Others (millipedes, centipedes, etc.)
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Insects vs Arachnids (Mites, Spiders)
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Breakup of OM into Smaller Particles Microinvertebrates – majority of soil animals (need a microscope). Microarthropods - general term for those arthropods (mites, insects) of v. small size. Some types are very important in decomposition.
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This note was uploaded on 03/01/2010 for the course PCB 4683 taught by Professor Williams,j during the Spring '08 term at University of Central Florida.

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11 - Beneficial Soil Organisms - Beneficial Soil Organisms...

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